'autoremove' in yum works by looking at the leaf rpmdb packages and intersecting this set with packages marked in yumdb with reason 'dep'. DNF keeps the same information for packages installed through DNF). Note however that DNF by itself will not leave any leaf packages behind as long as the clean_requirements_on_remove config option is True.
Giving this low priority.

dnf-plugins-core-0.0.8-2.fc20, libsolv-0.6.1-1.git6d968f1.fc20, hawkey-0.4.16-1.fc20, dnf-0.5.2-1.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.

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